All Roads Lead Home follows Stephen Mangan, Sue Perkins and Alison Steadman as they attempt to travel around the country using nature as their guide. They are helped by navigation expert Tristan Gooley.

Alison attempts to lead Sue and Stephen across North Wales to her home town of Liverpool. Along the way she has an emotional reunion at the theatre where she first made her name. Tristan Gooley helps the trio trek through thick fog, which sees their new-found navigational skills being tested.